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Issue 40, 2019
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Directed nanoscale metal deposition by the local perturbation of charge screening at the solid–liquid interface

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Abstract

Understanding and directing electrochemical reactions below the micrometer scale is a long-standing challenge in electrochemistry. Confining reactions to nanoscale areas paradoxically requires both isolation from and communication with the bulk electrolyte in terms of electrochemical potential and access of ions, respectively. Here, we demonstrate the directed electrochemical deposition of copper nanostructures by using an oscillating nanoelectrode operated with an atomic force microscope (AFM). Strikingly, the writing is only possible in highly dilute electrolytes and for a particular combination of AFM and electrochemical parameters. We propose a mechanism based on cyclic charging and discharging of the electrical double layer (EDL). The extended screening length and slower charge dynamics in dilute electrolytes allow the nanoelectrode to operate inside, and disturb, the EDL even for large oscillation amplitudes (∼100 nm). Our unique approach can not only be used for controlled additive nano-fabrication but also provides insights into ion behavior and EDL dynamics at the solid–liquid interface.

Graphical abstract: Directed nanoscale metal deposition by the local perturbation of charge screening at the solid–liquid interface

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Publication details

The article was received on 02 Jul 2019, accepted on 23 Aug 2019 and first published on 04 Oct 2019


Article type: Paper
DOI: 10.1039/C9NR05574F
Nanoscale, 2019,11, 18619-18627
  • Open access: Creative Commons BY-NC license
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    Directed nanoscale metal deposition by the local perturbation of charge screening at the solid–liquid interface

    M. Aarts and E. Alarcon-Llado, Nanoscale, 2019, 11, 18619
    DOI: 10.1039/C9NR05574F

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